CVE-2026-47070: Benoitc Hackney

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Sensitive Data Exposure vulnerability in benoitc hackney allows Retrieve Embedded Sensitive Data. The HTTP/3 redirect handler in src/hackney_h3.erl passes the original request headers unchanged to the redirect target without performing any cross-origin check. When a client issues an HTTP/3 request with follow_redirect enabled and includes Authorization or Cookie headers, a server responding with a 3xx redirect to a different host will cause the client to forward those credentials verbatim to the new origin. The main hackney.erl module has maybe_strip_auth_on_redirect/2 (guarded by the location_trusted option) to address CVE-2018-1000007, but hackney_h3.erl is missing this protection entirely. This issue affects hackney: from 3.1.1 before 4.0.1.

Affected products

• Benoitc Hackney: from 3.1.1, before 4.0.1 (fixed in 4.0.1)

Published 2026-05-25. Last modified 2026-07-24.